Treatment of fabrics



March 25, 1941. Q CRQFT 2,235,869

TREATMENT OF FABRIC Filed March 14, 1939 HHHHHHHwwlUHIH a INVENTOR CMCrofr ATTORN EYS l ntented Mar. 25, 194i entree TREATMENT or memos Cyril M. omit, Cumberland, Md, nssignor to Celaneoe Corporation of America, a corporation of Delaware Application March 14, 1939, Serial No. 261L639 t Claim.

This invention relates to'the preliminary treatment of iabrics priorto dyeing or other finishing treatment.

An object of my invention is to prepare fabrics and the like containing yarns of organic derivatives of cellulose whereby they may he dyed, dclustercd or otherwise finished while in rope form without the development or creases, streaks and litre detects. Uther objects oi my invention will appear from the following detailed description.

n the accompanying drawinc,

The figure shows more or less diagrammatically one term of apparatus for carrying out my invcntion. The scouring, dyeing end other liquid treat ments oi textile iahrice one very commonly accomplished one machine which consists esscn tiolly of a cinch mounted over a vat containing the liquid. The material hunched together in vvhot is commonly called rope form, is drawn continuously or intermittently from the liquor and replaced in the same by means of the winch which may he revolved mechcnlcally or otherwise. The rope may consist or a single piece of materiel or oi several pieces suitably fastened together so as to term an endless rope which may he passed continuously through the vat by suitably rotetinc the Winch. Such n machine is very simple in construction and in operation, and has the iurther odvantage of very large output since the runteriais under treatment are bunched together and several ropes may he treated simultaneously side by side on the Winch. a

ii the scourinc, dyeing or other liquid treat-- ment of certain materials, particularly were we iahric made of or containing yarns, filaments or other products of cellulose acetate orv other cellulosc esters or others and especially such yarns, filaments or other products which have been prepared by dry-spinning processes, ls'attempted on such winch machines, it is found that the materials are very liable to acquire creases which can only be removed with difllculty or not at all by any subsequent finishing operations. 1' have 45 found that this is due, particularly in the case oi Warp hnit fabric made 01 cellulose acetate ham to the loot that the stitches become h t clone the lines oi the longitudinal tolde which oc cur when fabric is treated on the winch hccauoc cl so the loot that during the liquidtreatment on the winch the Iabric shrinks in width and increases in lcnnth. r V

I hove found thnt it the fabric is first oohlooted to an aqueous both while in open width n While underrlongitudinal tension, the fabric in;

(or. c-uen causedlbhtretch in length and shrink in width, the stitch oi the fahricis set and the fabric does not tend to develop creases or other distortions when subsequently dyed or otherwise finished while in rope iorm, 5

While this invention will he described specifically in connection with iahric containing yarns oi cellulose acetate, it is also opplicahle to the treatment oi rubrics contnlninc yarnsof other organic derivatives of cellulose such as organic m esters of cellulose and cellulose others. Examples oi such organic esters of cellulose are cellulose iormate, cellulose propionate onol cellulose huty rate, while examples of cellulose others are ethyl cellulose, methyl cellulose end henzyl cellulose.

The invention is of particular importance in connection with the treatment oi warp mu fabric made oi cellulose acetate yarn hut it may he applied to other knit or woven inhricc. v

The preliminary treatment oi this invention is conveniently carried out in o hcth of Water which may or may not, contain other inrrcdients such as soap. The temperature oi this hoth is shove room temperature and preierahly is til to will" it While passing throughthic hath While under longitudinal tension and in open width, at warp knit fabric oi cellulose acetntc yarn may ohrtnls in width from 20 to 40% in extent and may increase in length from to to tdl; in cutout.

After this preliminary trcotrnent the iohric may be dried wholly or cnrtially. The iahric is then preferably sewn to join the longitudinal edges wherebyit is in tuhulor iorni.

After the preliminary thorough wetting out treatment, the fabric or garment may then he subjected to a dyeing, saponlflcatidn, delusterlng or other finishing treatment tvhile in rope form,

The fabrics may be subjected after the finishing treatment to any other desired treatment such as scouring, rinsing, dryiuo-tenterinc, etc. The resulting fabrics are tree oi creases and distentions.

In order further to illustrate my invention, but without being limited thereto, the iollowinn speciiic example is given, reference heing had to the drawing.

hill

Ercmnic till by means of rollers 8, 9, l and II, after which it passes over the spreader bar II. The fabric is then passed over the slotted suction device l3 which extracts most of the water to the wooden shell vl4 which is positively rotated and .around which the fabric is wound. The fabric so treated shrinks from a width of 80 inches to a width of 50 inches and has increased in length by 15 yards tailed description and drawing is given merely by way of illustration and that many variations may be made therein without departing from the spirit of my invention.

Having described my invention, what I desire to secure by Letters Patent is:

1. Method of avoiding creasing in the liquid treatment of warp knit fabric containing cellulose acetate yarn, comprising wetting out the fabric while in open width under longitudinal tension and while free to shrink in width, in an aqueous bath at 30-40 C. until the fabric shrinks about 37.5% in width and increases about 42% in length, and then subjecting it to the desired liquid treatment in rope form.

2. Method of avoiding creasing in the liquid treatment of warp knitted fabric comprising yarns of organic derivatives of cellulose comprising first subjecting the fabrics to treatment with an aqueous liquid while in open width and under longitudinal tension and while free to shrink in width until the fabric shrinks about 20 to 40% in width and increases about 25 to 45% in length and then subjecting them to a desired liquid treatment in-rope form.

3. Method of avoiding creasing in the liquid treatment of warp knitted fabric containing cellulose acetate yarn comprising first subjecting thefabrics to treatment with an aqueous liquid while in open width and under longitudinal tension and while free to shrink in width until the fabric shrinks about 20 to 40% in width and increases about 25 to 45% in length and then subjecting them to a desired liquid treatment in rope form.

4. Method of avoiding creasing in the liquid treatment of warp knit fabric containing cellulose acetate yarn comprising drawing under lon- 'gitudinal tension the fabric while in open width ment of warp knit fabric containing cellulose acetate yarn comprising drawing under longltuto 45% in length, then over a suction device adapted to extract water therefrom, and then subjecting it to a desired liquid treatment in rope form.

CYRIL M. CROFT. 

